Rework of Plugin _P056_SDS011-Dust (#451)

* First rework

* Moved classes to library

* Finished rework

lib/SerialDevices/SensorSerial.cpp

@@ -0,0 +1,81 @@
+/*-------------------------------------------------------------------------
+  Arduino library to ...
+
+  Written by Jochen Krapf,
+  contributions by ... and other members of the open
+  source community.
+
+  -------------------------------------------------------------------------
+  This file is part of the MechInputs library.
+
+  MechInputs is free software: you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation, either version 3 of
+  the License, or (at your option) any later version.
+
+  MechInputs is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with MechInputs.  If not, see
+  <http://www.gnu.org/licenses/>.
+  -------------------------------------------------------------------------*/
+
+#include <SensorSerial.h>
+
+
+SensorSerial::SensorSerial(int receivePin, int transmitPin, bool inverse_logic, unsigned int buffSize) : SoftwareSerial(receivePin, transmitPin, inverse_logic, buffSize)
+{
+  //boolean sws = isValidGPIOpin(receivePin);
+  _hw = receivePin < 0;
+}
+
+void SensorSerial::begin(long speed)
+{
+  if (_hw)
+    Serial.begin(speed);
+  else
+    SoftwareSerial::begin(speed);
+}
+
+int SensorSerial::peek()
+{
+  if (_hw)
+    return Serial.peek();
+  else
+    return SoftwareSerial::peek();
+}
+
+size_t SensorSerial::write(uint8_t byte)
+{
+  if (_hw)
+    return Serial.write(byte);
+  else
+    return SoftwareSerial::write(byte);
+}
+
+int SensorSerial::read()
+{
+  if (_hw)
+    return Serial.read();
+  else
+    return SoftwareSerial::read();
+}
+
+int SensorSerial::available()
+{
+  if (_hw)
+    return Serial.available();
+  else
+    return SoftwareSerial::available();
+}
+
+void SensorSerial::flush()
+{
+  if (_hw)
+    Serial.flush();
+  else
+    SoftwareSerial::flush();
+}